linux-kernel - RE: [PATCH] arm64: mm: free unused memmap for sparse memory model that define VMEMMAP

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Message-ID: <B926444035E5E2439431908E3842AFD255E7A1@DGGEMI525-MBS.china.huawei.com>
Date:   Wed, 8 Jul 2020 07:18:39 +0000
From:   "Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com>
To:     "liwei (CM)" <liwei213@...wei.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>
CC:     fengbaopeng <fengbaopeng2@...ilicon.com>,
        "nsaenzjulienne@...e.de" <nsaenzjulienne@...e.de>,
        "steve.capper@....com" <steve.capper@....com>,
        "rppt@...ux.ibm.com" <rppt@...ux.ibm.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        sujunfei <sujunfei2@...ilicon.com>
Subject: RE: [PATCH] arm64: mm: free unused memmap for sparse memory model
 that define VMEMMAP



> -----Original Message-----
> From: liwei (CM)
> Sent: Wednesday, July 8, 2020 1:56 PM
> To: catalin.marinas@....com; will@...nel.org
> Cc: liwei (CM) <liwei213@...wei.com>; fengbaopeng
> <fengbaopeng2@...ilicon.com>; nsaenzjulienne@...e.de;
> steve.capper@....com; rppt@...ux.ibm.com; Song Bao Hua (Barry Song)
> <song.bao.hua@...ilicon.com>; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org; sujunfei <sujunfei2@...ilicon.com>
> Subject: [PATCH] arm64: mm: free unused memmap for sparse memory model
> that define VMEMMAP
> 
> For the memory hole, sparse memory model that define
> SPARSEMEM_VMEMMAP do not free the reserved memory for the page map,
> this patch do it.

Hello Wei,
Just curious if this patch breaks MEMORY_HOTPLUG?

> 
> Signed-off-by: Wei Li <liwei213@...wei.com>
> Signed-off-by: Chen Feng <puck.chen@...ilicon.com>
> Signed-off-by: Xia Qing <saberlily.xia@...ilicon.com>
> ---
>  arch/arm64/mm/init.c | 81
> +++++++++++++++++++++++++++++++++++++++++++++-------
>  1 file changed, 71 insertions(+), 10 deletions(-)
> 
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index
> 1e93cfc7c47a..d1b56b47d5ba 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -441,7 +441,48 @@ void __init bootmem_init(void)
>  	memblock_dump_all();
>  }
> 

Thanks
Barry